CVE-2026-9733

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-23. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter.

When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function.

A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 23, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-9733: Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter

http://www.openwall.com/lists/oss-security/2026/06/23/1
generic
https://security.metacpan.org/patches/M/Mojolicious-Plugin-Web-Auth/0.17/CVE-2026-9733-r2.patch
generic

lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm - metacpan.org

https://metacpan.org/release/HAYAJO/Mojolicious-Plugin-Web-Auth-0.17/source/lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm#L129-131
generic

RFC 6749 - The OAuth 2.0 Authorization Framework

https://datatracker.ietf.org/doc/html/rfc6749#section-10.12

Vendor Advisories for CVE-2026-9733(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 64× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 385 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 11:11 UTCEG score recompute
  3. 2026-09-18 11:11 UTCGHSA enrichment
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-16 14:09 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 06:19 UTCGHSA enrichment
  9. 2026-09-14 02:07 UTCEG score recompute
  10. 2026-09-14 02:07 UTCGHSA enrichment
  11. 2026-09-13 16:48 UTCEPSS rescore
  12. 2026-09-13 12:28 UTCEG score recompute
  13. 2026-09-13 12:28 UTCGHSA enrichment
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 09:38 UTCEPSS rescore
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-08 22:01 UTCEPSS rescore
  19. 2026-09-06 13:48 UTCEPSS rescore
  20. 2026-09-05 15:31 UTCEPSS rescore
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 00:41 UTCGHSA enrichment
Show 75 more
  1. 2026-08-30 20:28 UTCEG score recompute
  2. 2026-08-30 20:28 UTCGHSA enrichment
  3. 2026-08-30 19:18 UTCEPSS rescore
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-26 14:47 UTCEPSS rescore
  8. 2026-08-25 13:49 UTCEPSS rescore
  9. 2026-08-25 06:51 UTCGHSA enrichment
  10. 2026-08-25 02:25 UTCGHSA enrichment
  11. 2026-08-24 22:13 UTCEG score recompute
  12. 2026-08-24 22:13 UTCGHSA enrichment
  13. 2026-08-24 14:18 UTCEPSS rescore
  14. 2026-08-24 13:55 UTCEG score recompute
  15. 2026-08-24 13:55 UTCGHSA enrichment
  16. 2026-08-24 05:02 UTCGHSA enrichment
  17. 2026-08-24 00:49 UTCGHSA enrichment
  18. 2026-08-23 20:36 UTCGHSA enrichment
  19. 2026-08-23 16:22 UTCGHSA enrichment
  20. 2026-08-23 12:10 UTCGHSA enrichment
  21. 2026-08-23 07:53 UTCGHSA enrichment
  22. 2026-08-23 03:22 UTCEG score recompute
  23. 2026-08-23 03:22 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-22 22:45 UTCGHSA enrichment
  26. 2026-08-22 14:01 UTCEG score recompute
  27. 2026-08-22 14:01 UTCGHSA enrichment
  28. 2026-08-21 23:49 UTCEPSS rescore
  29. 2026-08-21 22:39 UTCGHSA enrichment
  30. 2026-08-21 18:27 UTCGHSA enrichment
  31. 2026-08-21 14:14 UTCGHSA enrichment
  32. 2026-08-21 09:48 UTCGHSA enrichment
  33. 2026-08-21 05:35 UTCGHSA enrichment
  34. 2026-08-21 01:22 UTCEG score recompute
  35. 2026-08-21 01:22 UTCGHSA enrichment
  36. 2026-08-20 22:56 UTCEPSS rescore
  37. 2026-08-20 21:10 UTCGHSA enrichment
  38. 2026-08-20 16:57 UTCGHSA enrichment
  39. 2026-08-20 12:23 UTCGHSA enrichment
  40. 2026-08-20 07:49 UTCEG score recompute
  41. 2026-08-20 07:49 UTCGHSA enrichment
  42. 2026-08-19 17:04 UTCEPSS rescore
  43. 2026-08-19 15:37 UTCGHSA enrichment
  44. 2026-08-19 10:57 UTCGHSA enrichment
  45. 2026-08-19 04:50 UTCEG score recompute
  46. 2026-08-19 04:50 UTCGHSA enrichment
  47. 2026-08-18 13:49 UTCEPSS rescore
  48. 2026-08-17 13:47 UTCEPSS rescore
  49. 2026-08-17 13:03 UTCGHSA enrichment
  50. 2026-08-17 08:50 UTCGHSA enrichment
  51. 2026-08-17 04:38 UTCGHSA enrichment
  52. 2026-08-17 00:26 UTCGHSA enrichment
  53. 2026-08-16 20:13 UTCEG score recompute
  54. 2026-08-16 20:13 UTCGHSA enrichment
  55. 2026-08-16 14:56 UTCEPSS rescore
  56. 2026-08-16 14:14 UTCGHSA enrichment
  57. 2026-08-16 10:01 UTCGHSA enrichment
  58. 2026-08-16 05:49 UTCEG score recompute
  59. 2026-08-16 05:49 UTCGHSA enrichment
  60. 2026-08-16 02:15 UTCEPSS rescore
  61. 2026-08-16 01:37 UTCGHSA enrichment
  62. 2026-08-15 21:25 UTCGHSA enrichment
  63. 2026-08-15 17:13 UTCGHSA enrichment
  64. 2026-08-15 12:59 UTCGHSA enrichment
  65. 2026-08-15 08:46 UTCGHSA enrichment
  66. 2026-08-15 04:26 UTCEG score recompute
  67. 2026-08-15 04:26 UTCGHSA enrichment
  68. 2026-08-15 01:31 UTCEPSS rescore
  69. 2026-08-15 00:05 UTCGHSA enrichment
  70. 2026-08-14 19:53 UTCGHSA enrichment
  71. 2026-08-14 15:41 UTCGHSA enrichment
  72. 2026-08-14 11:29 UTCGHSA enrichment
  73. 2026-08-14 07:17 UTCGHSA enrichment
  74. 2026-08-14 03:04 UTCGHSA enrichment
  75. 2026-08-13 22:52 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-9733?
CVE-2026-9733 is a critical vulnerability published on June 23, 2026. Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter. When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via…
When was CVE-2026-9733 disclosed?
CVE-2026-9733 was first published in the National Vulnerability Database on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9733 actively exploited?
CVE-2026-9733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.7% of all scored CVEs.
What is the CVSS score of CVE-2026-9733?
CVE-2026-9733 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9733, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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